I can vouch for the Grizzly brand. Same idea as the Yeti, and the quality is excellent. The deciding factor that made me choose the Grizzly over the Yeti is because the Grizzly says it is made in the USA, and the Yeti does not...
I have taken it on several camping trips, and pack it tight with ice. Then after a couple days of camping, when everybody is out of ice, we open the Grizzly and use it to fill up everybody's coolers.
Yeti or Grizzly, just leave it in the shade and don't open it unless you absolutely have to, and it will hold ice for an exceptionally long time.